Experiments in optics, chromatics and acousticsL. Davis, 1774 |
Sommario
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Parole e frasi comuni
ABCD alſo angle anſwer aperture appear blue braſs cafe catoptrics circle cloſed colours concave mirror conſtruction deſcribed deſign diameter diſpoſed diſtance diviſions draw the lines drawn equal faid fame fide fimilar firſt fix inches fize focus furface glaſs glaſſes groove hole illufion inches wide inclined plane inſide inſtrument irregular figure lantern laſt leaſt leſs magic lantern moſt moveable muſt neceſſary objects obſerve opening oppoſite optical painted paper partition paſs paſſing paſte paſteboard perpendicular perſon pipes placed Plate pleaſing pleaſure point of view poſition preſent prifm priſm raiſe rays of light RECRE RECREATION reflection refracted repreſent ſame ſcenes ſecond ſee ſeen ſerve ſet ſeven ſeveral ſhades ſhall ſhould ſide ſize ſmall ſmoke ſome ſounds ſpace ſpectrum ſquare ſtand ſtill ſtops ſtrokes ſtrongly ſubject ſuch ſuppoſe theſe thoſe tranſparent trapezium tube uſed valve violet viſible wheel whoſe yellow
Brani popolari
Pagina 216 - This stand, together with the wheel, may be enclosed in a case, and so contrived, as to be moved from one room to another with very little trouble. It is evident, from the construction of this machine, that when a certain quantity of the sand is run out, the weight will descend, and put the wheel in motion, which motion will continue till the weight comes to the ground. If the wheel be required to continue longer in motion, two or more...
Pagina 140 - ... refrangible violet. 8. Such bodies as reflect two or more sorts of rays, appear of various colours. 9. The whiteness of bodies arises from their disposition to reflect all the rays of light promiscuously.
Pagina 206 - Let a thin tube, of an inch diameter, pass from the ear of one head through the pedestal, under the floor, and go up to the mouth of the other...
Pagina 23 - ... bend the length of it inward to the form of part of a circle, whose diameter is equal to double the focal distance of the glass.
Pagina 18 - This phenomenon arifes from feeing the piece through the conical furface of the water at the fide of the glafs, and through the flat furface at the top of the water, at the fame time : for the conical furface dilates the rays and makes the piece...
Pagina 21 - ... from whence the light comes, which will appear not a little extraordinary. In like manner the shadows will appear on the left, if the light fall on that side. If...
Pagina 24 - Fix it on a frame of the same figure, and put it on a moveable foot, that it may be easily placed at that distance from the glass, where the objects appear to the greatest perfection.
Pagina 159 - When the prisms are so placed that the two spectrums become coincident in an inverted order of their colours, the red end of one falling on the violet end of the other, if they be then viewed through a third...
Pagina 16 - When the water comes up to K, the piece at E will become vifible ; when it comes up to L, the pieces at E and F will appear ; and when it rifes to M, all the three pieces will be vifible.